[v6.1] BUG: unable to handle kernel NULL pointer dereference in set_page_dirty

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 7eaef76fbc46 Linux 6.1.20
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14d4df26c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=29ad3fe3c7b61175
dashboard link: https://syzkaller.appspot.com/bug?extid=c36d2e543e7ff63db7f1
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/34f95428f5fb/disk-7eaef76f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1bdd9b2c390d/vmlinux-7eaef76f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/419140981cfa/Image-7eaef76f.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c36d2e...@syzkaller.appspotmail.com

loop5: detected capacity change from 0 to 4096
ntfs3: loop5: Different NTFS' sector size (2048) and media sector size (512)
ntfs3: loop5: Mark volume as dirty due to NTFS errors
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Mem abort info:
ESR = 0x0000000086000006
EC = 0x21: IABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
user pgtable: 4k pages, 48-bit VAs, pgdp=00000001012ad000
[0000000000000000] pgd=0800000117521003, p4d=0800000117521003, pud=080000011adca003, pmd=0000000000000000
Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 7387 Comm: syz-executor.5 Not tainted 6.1.20-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : 0x0
lr : folio_mark_dirty+0x118/0x198 mm/page-writeback.c:2749
sp : ffff80002e2f7aa0
x29: ffff80002e2f7aa0 x28: 0000000000000000 x27: 0000000000000800
x26: 0000000000000000 x25: fffffc00047fd408 x24: 05ffc80000000057
x23: 1fffff80008ffa81 x22: dfff800000000000 x21: ffff8000126b6b98
x20: ffff0000de657a78 x19: fffffc00047fd400 x18: ffff80002e2f6d40
x17: 0004060000000014 x16: ffff8000121a8c80 x15: 0000000000000000
x14: 0000000000000002 x13: 0000000000000406 x12: 0000000000040000
x11: 000000000001dc39 x10: ffff80001e1a9000 x9 : ffff80000877b940
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000004
x2 : 0000000000000000 x1 : fffffc00047fd400 x0 : ffff0000de657a78
Call trace:
0x0
set_page_dirty+0x58/0x78 mm/folio-compat.c:62
ntfs_sparse_cluster+0x6fc/0xa58 fs/ntfs3/file.c:335
ntfs_fallocate+0x8b0/0xd88 fs/ntfs3/file.c:727
vfs_fallocate+0x478/0x5b4 fs/open.c:323
ksys_fallocate fs/open.c:346 [inline]
__do_sys_fallocate fs/open.c:354 [inline]
__se_sys_fallocate fs/open.c:352 [inline]
__arm64_sys_fallocate+0xc0/0x110 fs/open.c:352
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: bad PC value
---[ end trace 0000000000000000 ]---


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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: ca48fc16c493 Linux 6.1.27
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13175fd2280000
kernel config: https://syzkaller.appspot.com/x/.config?x=aea4bb7802570997

dashboard link: https://syzkaller.appspot.com/bug?extid=c36d2e543e7ff63db7f1
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10f3356c280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1187c7f2280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ec11c1903c52/disk-ca48fc16.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8ce41c1ad391/vmlinux-ca48fc16.xz
kernel image: https://storage.googleapis.com/syzbot-assets/affba5631cad/Image-ca48fc16.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/20c312afa176/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c36d2e...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 4096
ntfs3: loop0: Different NTFS' sector size (2048) and media sector size (512)
ntfs3: loop0: Mark volume as dirty due to NTFS errors

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Mem abort info:
ESR = 0x0000000086000006
EC = 0x21: IABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault

user pgtable: 4k pages, 48-bit VAs, pgdp=000000010a385000
[0000000000000000] pgd=0800000112355003, p4d=0800000112355003, pud=080000011608f003, pmd=0000000000000000

Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP
Modules linked in:

CPU: 1 PID: 4216 Comm: syz-executor391 Not tainted 6.1.27-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023

pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : 0x0
lr : folio_mark_dirty+0x118/0x198 mm/page-writeback.c:2749

sp : ffff80001d9a7aa0
x29: ffff80001d9a7aa0 x28: 0000000000000000 x27: 0000000000000800
x26: 0000000000000000 x25: fffffc0005c84a08 x24: 05ffc80000000057
x23: 1fffff8000b90941 x22: dfff800000000000 x21: ffff8000125414d8
x20: ffff0000df407318 x19: fffffc0005c84a00 x18: 000000000010014c
x17: 0004060000000014 x16: ffff800012034640 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000406 x12: 0000000000000000
x11: ff8080000876e7e0 x10: 0000000000000000 x9 : ffff80000876e7e0

x8 : 0000000000000000 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000004

x2 : 0000000000000000 x1 : fffffc0005c84a00 x0 : ffff0000df407318

Call trace:
0x0
set_page_dirty+0x58/0x78 mm/folio-compat.c:62
ntfs_sparse_cluster+0x6fc/0xa58 fs/ntfs3/file.c:335
ntfs_fallocate+0x8b0/0xd88 fs/ntfs3/file.c:727
vfs_fallocate+0x478/0x5b4 fs/open.c:323
ksys_fallocate fs/open.c:346 [inline]
__do_sys_fallocate fs/open.c:354 [inline]
__se_sys_fallocate fs/open.c:352 [inline]
__arm64_sys_fallocate+0xc0/0x110 fs/open.c:352
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: bad PC value
---[ end trace 0000000000000000 ]---


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